The first day I would build
Choose mountain or coast first, then let the rest of the day support it.
- Use Huaguo Mountain when the weather is clear and you want the main outdoor climb.
- Use Liandao when the day should feel coastal, slower, and sea-facing.
- Keep seafood or Lianyun Old Street as the softer landing after the outdoor block.
Lianyungang becomes clearer once you stop treating every sight as equal. Huaguo Mountain is a real energy choice; Liandao is a different kind of day, with more sea air and less vertical effort.
After the main outdoor piece, I would not add a far-away second mission unless the group still feels fresh. A seafood dinner or old-street browse usually makes the day feel more complete than another rushed transfer.